Abstract
Field experiments are described comparing the yield of herbage on a series of grass-clover plots which were irrigated after various deficits had developed. In addition to the irrigation treatments, different rates of nitrogen were applied. The maximum yields were obtained when only small deficits were allowed (maximum pF 3·3). This applied particularly to grass-clover swards to which no nitrogen fertilizer was applied. There was not much reduction in yield on predominantly perennial ryegrass swards liberally supplied with nitrogen when larger deficits were allowed to develop (pF c. 4·0). Estimates of soil water deficit from meteorological data using Penman's method agreed very well with direct measurements.
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Claims 4
Claim · model-written summary
Maximum herbage yields occurred with small water deficits.
Verbatim
e0“The maximum yields were obtained when only small deficits were allowed (maximum pF 3·3).”
e1“grass-clover plots which were irrigated after various deficits had developed.”
Claim · model-written summary
The small-deficit yield advantage was especially pronounced in unfertilized grass-clover swards.
Verbatim
e0“This applied particularly to grass-clover swards to which no nitrogen fertilizer was applied.”
e1“The maximum yields were obtained when only small deficits were allowed (maximum pF 3·3).”
Claim · model-written summary
Nitrogen-fed ryegrass swards had little yield reduction under larger water deficits.
- Taxon
- perennial ryegrass
Lolium perennee0 - Treatment
- larger deficitse0
- Outcome
- yielde0
- Direction
- not much reductione0
- Value
- pF c. 4·0e0
- Comparator
- various deficitse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was not much reduction in yield on predominantly perennial ryegrass swards liberally supplied with nitrogen when larger deficits were allowed to develop (pF c. 4·0).”
e1“irrigated after various deficits had developed.”
Claim · model-written summary
Penman estimates of soil water deficit agreed well with direct measurements.
Verbatim
e0“Estimates of soil water deficit from meteorological data using Penman's method agreed very well with direct measurements.”
t0“grassland”